established facts about the massacre of 25 May 1995 and its 71 victims, including all the documents from the trial, thanks to the cooperation with the Balkan Investigative Research Network. Prosecution of the perpetrators Novak Đukić, a former VRS officer was arrested in Banja Luka on 7 November 2007. At the time of the attack Đukić was the commander of Tactical Group Ozren. His trial began on 11 March 2008. On 12 June 2009, the Court of Bosnia and Herzegovina found Đukić guilty and sentenced him to 25 years imprisonment. On 10 September 2010 the Appellate Panel dismissed Đukić's appeals as unfounded and upheld the first instance verdict of 12 June 2009 in its entirety. Đukić was released in February 2014, after the Constitutional Court of Bosnia and Herzegovina had nullified a series of rulings due to misapplication of the law (Maktouf-Damjanovic issue). In a new trial, he was again sentenced to 20 years of imprisonment in June 2014. Đukić absconded and repaired in Serbia, country of which he also had acquired citizenship. An arrest warrant was issued for him in October 2014, to no avail. Bosnia and Herzegovina then asked Serbia, on the basis of the existing protocols on judicial cooperation, to enforce the final ruling against Đukić in Serbia. Proceedings in Serbia started only in February 2016. Đukić's defense used the proceedings to claim his innocence and spread historical revisionist theories about the massacre of Tuzla's Kapija. Đukić also delayed the trial by not attending the hearings for purported health reasons (hospitalisations at the Military Medical Academy). In 2018 experts claimed that Đukić was temporarily incapacitated and delayed the trial for one more year. According to the EU's 2016 interim benchmarks for chapter 23 of the EU accession negotiations, Serbia is expected to "engages in meaningful regional cooperation and good neighbourly relations in handling of war crimes by avoiding conflicts of jurisdictions and ensuring that war crimes are prosecuted without any discrimination. All outstanding issues in this regard must be fully resolved." Historical revisionism In 2009, Prime Minister of Republika Srpska Milorad Dodik stated that the attack was staged and questioned the Markale massacre at Sarajevo. The Tuzla municipality filed charges against Dodik over these statements. The city of Sarajevo filed criminal charges against Dodik for abuse of power, and inciting ethnic, racial and religious hatred. The Office of the High Representative said Dodik denied the war crimes